body {
    font-family: '微软雅黑', sans-serif;
    margin: 0;
    padding: 0;
    background: url('https://img.freepik.com/free-vector/cute-cartoon-kids-background_23-2148987370.jpg') no-repeat center center fixed;
    background-size: cover;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

h1 {
    font-size: 48px;
    color: #ff6f61;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    margin: 20px 0;
    text-align: center;
}

.name-display {
    font-size: 64px;
    font-weight: bold;
    color: #333;
    margin: 40px 0;
    text-align: center;
    background: rgba(255, 255, 255, 0.8);
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
}

.controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

#start-button {
    font-size: 36px;
    padding: 20px 40px;
    background-color: #ff6f61;
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
    transition: background-color 0.3s;
}

#start-button:hover {
    background-color: #ff4a3d;
}

#speed-control {
    width: 200px;
    margin-top: 20px;
}

.selected-name {
    color: #1e90ff;
    font-size: 72px;
    animation: bounce 0.5s;
}

@keyframes bounce {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}